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FEC (Forward error Correction) forward error correction UDP\RTP used to improve wireless and other network packet loss problems The algorithm is not introduced at this stage. Idea: FEC ENCODE adds redundant packets, and when the wireless network drops packets, the receiver uses redundant packets to decode the lost packets. Example: 10 packets, the code will ad
for the TCP-based development of the communication program, there is a very important problem to solve, that is, packet and unpacking. I. Why TCP-based communication programs require packets and unpacking. TCP is a "flow" protocol, the so-called flow, is a string of data without bounds. You can think of the river water, is connected into a piece, in the meantime there is no dividing line. However, the general communication program development needs to
module received after the router module sent the network declaration frame, forwarded.Frames 16th and 17th: The network connection status frame that is emitted when the coordinator module and the router module are working stably. After the network coordinator and router in the net, the behavior of stable operation is that every once in a while to send an Interne
Tongteng Network Shunt, also known as the core network collector, is an important basic equipment for the network monitoring front-end in the network security field. It is an essential equipment for the entire network security! It plays a key role in
Modify shared bandwidth packets-Increase the public network IP Describe Increase the public network IP in the specified shared bandwidth packet Request parameters name type must describe action string system specified parameters, values: Addbandwidthpackageips regionid string
In fact, it has been a long time to explore the problem of network card packet capture. I found some basic things in the last few days. I will just repeat them here. Packet Capture first needs to know that the data transmitted through the NIC is actually through the underlying link layer (MAC). in Linux, the data traffic we obtain from the NIC is actually directl
Simulate the network packet sending and receiving delay for the specified IP port on Linux. When compiling network applications, we usually test and debug the network on a LAN or even a local machine. Is there a way to simulate a complex Internet environment-especially network
Qt packet abstraction based on TCP network program I have no experience before. When sending data packets, the packet header and other information are all implemented by redefining a struct. Different protocol packages have different structs. The result is as follows: how many upper-layer business protocol packages are there? I will re-define a new structure corr
This article mainly introduces the Python socket network programming sticky packet problem, and now share to everyone, but also to make a reference. Come and see it together. One, sticky bag problem details 1, only TCP has sticky packet phenomenon, UDP never sticky packet Your program actually does not have the right
1 Introduction to Analog delay transferNetem and Tc:netem are a network emulation function module provided by Linux 2.6 and above kernel versions. The function module can be used to simulate complex Internet transmission performance in a well-performing LAN, such as low bandwidth, transmission delay, packet loss and so on. Many distributions of Linux with Linux 2.6 (or more) versions of the kernel feature t
Network Layer -- IP packet header introduction IP packet is also called IP packet grouping. It is transmitted at the network layer in Layer 7 structure of ISO network. It consists of IP packet
This article introduces some programming of the original socket (raw socket) implemented by C # in Windows Sockets and the network packet Monitoring Technology Based on this. Compared with winsock1, Winsock2 supports the raw socket type most obviously. Using raw socket, you can set the NIC to the hybrid mode. In this mode, we can receive the IP packet on the
Let's start by recognizing what a packet loss is, and what kind of phenomenon is being lost to the network: Data is transmitted on the Internet on a packet-by-unit basis, with a packet of NK, no more, no less. That is to say, no matter how good the network line
Tcpdump helps us capture and save network packages. the saved network packages can be used to analyze network load conditions. The packages can be parsed using the tcpdump command, or saved as files suffixed with pcap, use wireshark and other software for viewing. The following nine examples of using tcpdump are provided to illustrate the specific use of tcpdump.
The so-called zero copy means that there will be no inter-memory copy during the packet sending and receiving process of a node. When the packet is sent, the user buffer of the application will directly go through the network interface to reach the external network, when receiving, the
more than 1000 lattice. The space capacity of each lattice is limited. When large data needs to be stored, the whole capacity is sufficient, but the capacity of the small lattice is not enough. At this point, there will be a problem of packet loss. It appears that memory is sufficient at this time, but there is no contiguous space in memory to store the data at this time. So these seemingly large available memory, in fact, can not save much data.
Bulk Network packet transmissionTranslation zhangzl2013Link: http://www.cnblogs.com/zhangzl2013/p/bulk_network_packet_transmission.htmlOriginal Jonathan CorbetOriginal link: Bulk network packet transmissionThis article may be reproduced, resulting in the fragmentation of comment messages. Students who want to participa
An ICMP echo Request packet is a query sent by a host or router to a specific destination host, and the machine receiving the message must send an ICMP echo reply message to the source host. This inquiry message is used to test whether the destination station is reachable and to understand its status. It should be noted that Ping is an example of a direct use of the network layer ICMP, which does not pass
IOS security-network packet analysis tool Charles I wrote an article earlier: IOS development-image search (source code + resolution) Many of my friends are curious about how I got Baidu's image search API, which is actually very simple. The network packet analysis tool "Charles" can be easily implemented. To obtain t
The internet has the ability to provide transmission service for distributed applications on the end system, which is related to the ability of packet switching network to transmit packets between many end systems, which is associated with network performance.This lesson mainly studied 1,. Time delay 2, packet loss rat
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